Engine-muffler.



C. J. KNOPP.

ENGINE MUFFLER.

APPLICATION FILED MAR. 29, 1912.

m J 5 k r Patented NOV. 12, 1912.

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Specification anteat r: latent. I

Patented Nov. 12, 1912.

Application m ma :9, 1912. semi K0. sauce.

To all whom it may concern I -Be it known that I, CHARLES J. Knorr,

a citizen of the United States, residing at Chicago, in the county of Cook and 'State of Illinois, have invented certain new and useful Improvements in Engine-Mufliers, of which the following is a specification.

The mufiier which is the object of the present invention is designed more particularly for internal-combustion engines, and its object is to provide a muflier which will render the discharge of the exhaust gases from the engine less objectionable, the discharge being without noise and with no back pres sure on the engine.

With this object in view, the invention consists in a novel construction and arrangement of parts to be hereinafter described and claimed. i

In the accompanying drawing forming a part of this specification, Figure 1 is a central, longitudinal section of the mufller, and Fig. 2 is a cross section on the line 2-2 of Fig. 1. v

eferring specifically to the drawing, 5 denotes the casing of the'mufller, thesame being cylindrical in form and closed at one of its ends by a head 6, this being the inlet end of the casing. To the opposite or outlet end of the casing is fitted a head 7 having outlet perforations 8. These heads are secured to the casing ends in any suitable manner. On the outside (if the-head 7, over chamber 9 having ail outlet nipple 10 to which may be connected a suitable dischar e pipe 11. Surrounding the outlet, within t e chamber, is an annular flange 12 which serves as a baflie to deflect'the gases before they pass into the outlet.

In the casing 5 are located two concentric and spaced tubes 13 and 14 res tively.

The tube 13 is connected to the hea 6, which latter has an inlet 15 to which is connected the exhaust pipe 16 of the engine. The

tube 13' is inline with the inlet 15 and extends lengthwise into the casing 5, its inner end being open and terminatin a short dis- 14 is connected to the head 7 and surrounds the tube 13, and the inner end of said tube 14 terminates -a short distance from the head ".6. The tube 14 is spaced from the cylindrical wall of the casing 5, forming an annular space 17 As the tube 14 is spaced from the tube 13, an annular space 18 is formed therebetween. i The tube 13 opens atits inner end, or adjacent to the outlet end of the casmg 5, into the space 18, and said space is in communication with the s ace 17 adjacent to the inletend of the casing 5. The perforations 8 open into the space 17.

It will be evident from the foregoing that the exhaust gases travel in a tortuous path through the casing 5, they being carried by the tube 13 to one end of the casing and then discharged into the space 18, through which latter they pass toward the opposite end of the casing, and thence through the space 17 to the first-mentioned end of the casing. From the space 17 the gases pass through the perforations 8 into the chamber 9 and escape from the latter through the outlet thereof, they being deflected by the bafile 12 before leaving the chamber.

In the spaces 17 and 18 are transverse partitions 19 which are perforated as indicated at 20.. The partitions of the space 17 are set staggered with respect to the partitions of the space 18. i

It will be readily seen that by the structure herein described, the force of the exhaust gases is broken up in their tortuous passage through the muflier and through the relatively small perforations 20. The gases can also freely expand in the mufiler and they are discharged without noise and with no back pressure on the engine.

I claim: 1 the perforations 8, ismounted an expansion 7,

1. An exhaust muflier comprising a casing, heads closing the ends of the casing, one of said heads having an inlet and the other head havingi outlet perforations, an expansion chamber mounted on the lastmentioned head over the outlet perforations, spaced tubes in the casin one of said tubes being connected to the inlet head in line with the inlet and terminating short of the outlet head, and the other tube surrounding the first-mentioned tube and being connected to the outlet head and terminating short of the inlet head, the last-mentioned tube being also s aced from the side of the casing and the a oresaid outlet perforations communicating with the space between said last-mentioned tube and the casing, and perother head an outlet, spaced tubes in the casing, one of said tubes being connected to the inlet head in line with the inlet and terminating short of the outlet head, and 5 the other tube surrounding the first-mentioned tube and being connected to the outlet head and terminating short of the inlet head, the last-mentioned tube being also spaced from the side of the casing and the 10 aforesaid outlet communicating with the space between said last-mentioned tube afid the casing, perforated transverse partitions in the spaces between the tubes and in the space between the casing and the last-mentioned tube, an expansion chamber mounted on the outlet head into which chamber the outlet opens, said chamber having an outlet, and a bafiie surrounding the last-mentioned outlet.

In testimony whereof I afiix my signature 20 'in presence of two witnesses.

CHARLES J. KNOPP.

Witnesses:

H. G. BA'roHELoR, -S. J. LEHRER. 

